Milton tennison



(No Model.)

M. TENN ISON. MACHINE FOR GRINDING PLOW POINTS. No. 275,792.

Patented Apr, 10,1883. f

n. PETERS. nkwuw nm'mwmm a. Q

NITED STATES PATENT OFFICE.

MILTON TENNISON, OF NORTH GREECE, NEW YORK.

MACHINE FOR GRINDING PLOW-POINTS.

SPECIFICATION forming vpart of Letters Patent No. 275,792, dated April10, 1883.

Application filed October 27, 1882. (No model.)

To all whom it may concern:

Be it known that I, MILTON TENNISON, of North Greece, Monroe county,"New York, have invented a certain new and useful Improvement inMachines for Grinding Plow- Points; and I do hereby declare that thefollowing is a full, clear, and exact description.

of the same, reference being had to the accompanying drawings, in which-Figure 1 is a. plan of the machine. Fig. 2 is a side elevation,partially in section. Fig. 3 is a plan of the guide-bar and itsattachments on an enlarged scale. Fig. 4 is a bottom view of aplow-point and a portion of the guide-bar to which it is attached.

In this machine a grindstone is mounted in a frame, and a guide-bar isemployed, to one end of which is attached the plow-point, the other endof the guide-bar having a cylindrical pin which passes through a slot ina vertical turnstile revolving in the frame, by which means theplow-point can be properly guided over the surface of the stone. Asand-box is mounted on the end of the bar, and an inclined chute islocated below the box of sufficient width to discharge the sand thatescapes from the box directly upon the surface of the stone just back ofthe point of contact of the plowpoint with the stone in grinding.

The invention consists in the combination of the guide-bar, thesand-box, and the chute, as above set forth.

In the drawings, A shows the frame, which may be of any desired form.

B is a vertical truss of the frame, in which is located the turnstile 0,consisting simply ot'a wooden block having end pivots, a a, which restand turn in the frame. This block is provided with a slot, 1), for thereception of the pin on the guide-bar.

D is the guide-bar, made of wood, and having a cylindrical pin, 0, atits rear end, which rests in the slot 12, and has such freedom ofmovement therein that the bar is allowed to play sidewise and up anddown to a limited extent to properly guide the plow-point over thestone. I

d is an iron shoe of angular form, bolted to the opposite end of theguide-bar, and to this shoe the plow-point G is secured by bolting orotherwise, standing bottom upward, and at such an incline as to presentthe edge of the point properly to the stone.

H is the grindstone, which is of ordinary form, and is driven by apulley, g, on its shaft, or by other suitable means.

I is a sand-box mounted on top of the bar, near the plow-point, andprovided with a perforated bottom, through which the sand escapesslowly.

K is a chute or guideway attached to the bar and resting under thesand-box, also extending forward in an inclined direction, so astodirect the sand on top of the stone and directly back of the contactof the plow-point with the stone. The chute is made of considerableWidth, so that in the lateral play of the guide-bar from side to side tobring dilferout parts of the edge of the plow-point on the stone thechute will still cover the stone and discharge the sand thereon at alltimes.

In this apparatus the operator stands on a platform, 71., astride thebar, and holds the lat ter in his hands, guiding the bar from side toside and forward and back, as necessity requires, in grinding the wholeedge. He can also bear his Whole weight on the bar. The turning of theturnstile and the end movement of the pin 0 therein allows thesemovements to be made. The sand passing down the chute and falling on thestone is carried under the plow-point by the turning of the stone, andgreatly facilitates the grinding.

What I claim as new, and desire to secure by Letters Patent, is-

The combination ofthe turnstileO, the guidebar D, the sand-box I, andthe chute K, the chute being of such width as to cover the stone duringthe side movements of the bar, as shown and described, and for thepurpose specified.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

MILTON TENN ISON. Witnesses:

R. F. Oseoon, JACOB SPAHN.

